Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
  • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
  • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
  • B21J5/12—Forming profiles on internal or external surfaces
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
  • B21K1/00—Making machine elements
  • B21K1/28—Making machine elements wheels; discs
  • B21K1/30—Making machine elements wheels; discs with gear-teeth
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49462—Gear making
  • Y10T29/49467—Gear shaping
  • Y10T29/49474—Die-press shaping

Definitions

• the invention relates to a method for producing a synchronous component with short teeth with undercut teeth for manual transmissions by precision forging, the teeth, each of which is attached to a common cylinder surface with its radially inner side and with its foot on a common lower plane surface are placed, first manufactured with parallel tooth flanks and then finished upset.
• Such a method for producing clutch parts with claws or pockets for power transmission is known from DE AI 31 34857.
• claws are produced during the forging process, the top surfaces of which are produced with oversize at least along their edges common to the coupling surfaces.
• the desired inclination of the coupling surfaces is achieved by a subsequent calibration stroke.
• the claws can be supported between die surfaces running transversely to the coupling surfaces.
• the present invention has for its object to enable the unrestricted application of the known method to synchronous components of the type mentioned and to achieve increased accuracy in the formation of the coupling surfaces.
• Process step a) can be carried out by cold or hot forging; Equivalent cold extrusion is also an option.
• Method step b which relates to one or more calibration strokes, comprises a three-stage deformation by calibration, so it differs fundamentally from the prior art mentioned.
• a first stage aa the tooth heads produced with an oversize in the direction of the tooth length are first pre-compressed; the straight tooth flanks, that is to say in radial planes with respect to the cylinder surface common to all teeth, are essentially retained.
• This strain hardening in the foot area is not only very important for the precise shaping of the tooth root curve; their special effect is that, when they are subsequently dipped, the tooth form according to. Feature cc) controls the slope of the tooth flanks forming the coupling surface exactly. Depending on the tooth height, backmost angle of the tooth flanks and flank shape accuracy, it may be appropriate to support the tooth flanks on the die side. At the same time, during the third deformation stage, the roof shape of the tooth heads, which is characteristic for short toothing, is finished, the tooth flanks receiving their final slope.
• the cylinder surface in the region of the tooth heads is limited by an upper plane surface over which the semifinished product tooth heads protrude with at least a part of their size and that the teeth are of such a type during the final upsetting are deformed so that the tooth tips end in or below the upper flat surface.
• the degree of deformation during upsetting of the tooth heads is to be controlled in such a way that the teeth formed on the semifinished product are sheared from the cylinder surface in a region lying between the upper flat surface and the finished tooth head shape at the latest during the finished upsetting. It is easy to imagine in this connection that the sheared material is formed in the direction of the tooth gap, forming the oblique tooth flanks; the cylinder surface common to all teeth forms an effective support surface which does not prevent deformation and which can be unconnected to the tooth in the region of the largest tooth width.
• the following explains the manufacture of a synchronous component with reference to the drawing. It shows:
• Fig. 2 shows a perspective section of the
• Synchronous component in the side looks with teeth in different deformation levels
• Fig. 3 is a schematic representation of a tooth in three different deformation stages.
• the half section shown in FIG. 1 through a number of possible variants selected synchronous component 1 with central bore 2 shows an annular body 3 shown with hatched cross section, on which a cylindrical surface 6 is formed between an upper flat surface 4 and a lower flat surface 5.
• the teeth 7 of a short toothing are attached to the cylindrical surface 6, a total of four segments 8 with five teeth each attached to it being distributed over the circumference of the synchronous component 1.
• FIG. 2 shows a section of such a segment 8 with a fully formed tooth 7 and two further teeth, which represent the stages of the manufacturing process.
• the right tooth with the designation aa) corresponds to the tooth shape of the semi-finished product manufactured by the hot forging process.
• This tooth has, based on the segment 8, tooth flanks 9 running along radial planes and a roof-shaped tooth head 10, the roof shape coming to lie approximately above the upper flat surface 4 of the segment 8.
• a finished tooth 7 designated cc) is shown on the left, but the tooth flanks 9 forming the coupling surfaces are shown with a greatly exaggerated inclination.
• This tooth is significantly shorter in length than the tooth of deformation stage aa) shown on the right, as a result of two upsetting processes namely from the forging mold aa) into the intermediate mold bb) shown in FIG. 3 and then into the final mold cc).
• the two last-mentioned deformation stages bb) and cc) are preferably implemented by two successive calibration strokes.
• the tip of the tooth head of the finished tooth 7 coincides approximately with the flat surface 4.
• this geometric relationship is not essential. With other synchronous components, the tooth head can protrude slightly both above the upper plane surface 4 and lie below it.
• FIG. 2 shows a finished tooth 7 (in solid lines) and a forged tooth (in dashed lines) according to the right-hand shape cc) of the semi-finished product.
• the middle tooth representation is intended to demonstrate the degree of deformation from pre-forging to final calibration. This is particularly clear from the presentation acc. Fig. 3 shows. 3, the cylindrical surface 6, projected into the plane, is shown between two dashed lines.
• the respective deformation from the deformation stage aa) for pre-forging to bb) for pre-upsetting and further to cc) for finished upsetting is exaggerated to illustrate the situation.
• the latter two process stages take place within the calibration process, namely through one or more calibration strokes.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Forging (AREA)
• Gears, Cams (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6241368

Family Applications (1)

Country Status (14)

Cited By (6)

Families Citing this family (16)

Citations (4)

Family Cites Families (5)

• 1984
  • 1984-07-24 DE DE3427156A patent/DE3427156C2/de not_active Expired
• 1985
  • 1985-07-08 WO PCT/EP1985/000335 patent/WO1986000838A1/de active IP Right Grant
  • 1985-07-08 DE DE8585903281T patent/DE3562319D1/de not_active Expired
  • 1985-07-08 EP EP85903281A patent/EP0189447B1/de not_active Expired
  • 1985-07-08 US US06/857,744 patent/US4700446A/en not_active Expired - Lifetime
  • 1985-07-08 HU HU853610A patent/HU198139B/hu unknown
  • 1985-07-08 JP JP60503154A patent/JPS61502736A/ja active Granted
  • 1985-07-08 BR BR8506856A patent/BR8506856A/pt not_active IP Right Cessation
  • 1985-07-19 IN IN539/CAL/85A patent/IN164593B/en unknown
  • 1985-07-22 ZA ZA855513A patent/ZA855513B/xx unknown
  • 1985-07-23 ES ES545490A patent/ES8701549A1/es not_active Expired
  • 1985-07-23 IL IL75883A patent/IL75883A/xx not_active IP Right Cessation
  • 1985-07-23 YU YU1210/85A patent/YU45265B/xx unknown
  • 1985-07-24 CA CA000487439A patent/CA1249458A/en not_active Expired
  • 1985-07-24 CS CS855464A patent/CS259530B2/cs not_active IP Right Cessation

Patent Citations (4)

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